<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>v-on基本使用</title>
</head>
<body>
  <div id="app">
    <h2>当前计数为：{{counter}} </h2>
    <!-- <button v-on:click="increment">+</button>
         <button v-on:click="decrement">-</button> -->
         
    <!-- 语法糖写法 -->
    <!-- 只有当click事件调用的方法没有参数时才可以不加() -->
    <button @click="increment">+</button>
    <button @click="decrement">-</button>

  </div>
  
  <script src="../js/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        counter: 0,
      },
      methods: {
        increment() {
          this.counter++;
        },
        decrement() {
          this.counter--;
        }
      }
    })
  </script>
</body>
</html>